Insulator



Dec. 29, 1931. Q EHM|LLER 1,838,319

INSULA TOR Filed April 9, 1929 2. Sheets-Sheet 1 l N V Cid/r1 94; 6.

C ML C. E. MILLER Dec. 29, 1931.

INSULATOR Filed April 9, 1929. 2 Sheets-Sheet Patented Dec. 29, 1931PATENT oFFIcE GEARLLES E. MILLER, 01'! PITTSBURGH, PENNSYLVANIAINSULATOR Application filed April 9,

This invention relates to insulators and more particularly to the typeknown as wire holders in which a hole extends transversely through thebody portion to receive an associated electric wire directly, or toreceive a tie wire employed to tie the electric wire to the insulator. v

Insulators of this type are usually provided with a supporting pinextending outwardly from the base and, as heretofore constructed, thesesupporting pins have generally been secured to a metal plate extendingacross the bottom of and secured to the porcelain so as to form ametallic base for the entire structure. The presence of this metal isobjectionable due to corrosion and rusting and the resultant weakeningof the structure and the discoloration of the associated wall or othersupport. Those insulators in which the metallic base has been eliminatedhave consisted merely of a supporting pin cemented in a pin receivinghole in the bottom of the porcelain. Such an arrangement not onlyprovides a comparatively weak construction, but allows the associatedelectric wire to drop if the porcelain is broken or fractured.

An object of this invention is to provide an insulator of the type setforth constructed 0 and arranged to overcome the above set forthobjections.

A further object is to provide a wire holder constructed and arranged toprevent dropping of the associated wire in case the porcelain bodybreaks.

A still further object is to provide a wire holder of simple, ruggedconstruction which will be cheap and easy to manufacture and assemble.

These and other objects which will be apparent to those skilled in thisparticular art are attained by means of the invention illustrated in theaccompanying drawings in which Fig. 1 is a perspective view of a wireholder constructed in accordance with one embodiment of this invention.Fig. 2 is a transverse sectional view thereof, and Fig. 3 is a similarview on the line 33 of Fig. 2.

Fig. 4 is a view similar to Fig. 2, showinga di erent way in which thesupporting pm 1929. Serial No. 353,782.

can be connected to the insulator body portion.

The particular embodiment of this invention which has been chosen forthe purposes of illustration is shown in connection with the bodyportion 10 of a wire holder formed of porcelain, glass or other suitableinsulating material and having the usual groove 11 in the end thereofand a wire hole 12 extending transversely through the body portion. Aninsulator supporting pin 13 extends into a pin receiving hole 14 in thebase of the body and suitable means is provided for positively lockingthe pin in position without either cementing the pin in the receivinghole or providing a metal base to the body portion 10.

As illustrated in Figs. 1 to 3, the body portion 10 is provided withgrooves 15 extendink longtiudinally along the outer surface thereof andformed on diametrically opposite sides. At one end, the groovesterminate in a passage 16 extending transversely through the bodyportion from one groove to the other and intersecting the inner end of Fthe pin receiving recess 14. In the form illustrated in Figs. 1 to 3, amore or less ductile metallic locking member 17 is inserted through thepassageway 16 and the ends thereof are bent so as to lie within thegrooves 15. A suitable joint is formed between the pin 13 and thatportion of the locking member 17 which intersects the pin receivingpassage 1 1 for locking the pin in place. The pin head 18 is of a sizecapable of passing through the wide portion 19 of a slot formed in thelocking member 17, but too large to pass through the narrow portion 20of such slot. The head is provided with undercut grooves for receivingthe edges of the narrow portion of the slot after the head has passedthrough the wide portion thereof and been moved into the narrow portion.As a result of this construction, when the locking member is positionedwith the wide portion of the slot in the pin receiving recesslt, the pincan be inserted in place and the head 18 thereof passed through theslot. Longitudinal movement of the locking member 17 through the passage16 so as to bring the narrow portion 20 of the locking slot beneath thepin head 18 efiectively locks the pin in position and the locking memberis positively secured in place by the bent ends thereof which lie in thelongitudinally extending grooves 15. rivet or other form of fasteningpin 22 extends through a passage 23 in the body 10 which connects theouter ends of the grooves 15 and is located on the opposite side oi thewire receiving hole 12 from the passage 16.

It will be apparent that the present invention provides a wire holderhaving a plain porcelain base and in which the supporting pin ispositively and mechanically locked in place and which at the same timeis of such construction and arrangement that breaking of the porcelainbody portion 10 will not permit the associated wire to drop for thereason that either such wire or a connected tie wire, extending throughthe wire opening 12, will be held against dropping by the surroundingloop formed by the locking member 17 and the rivet or tie rod 22.

In Fig. 4 the pin 13 is provided with a head 18 and similar in allrespect-s to the pin illustrated in Figs. 1 to 8. The locking member 34:is similar to the locking member 17, the only difference in theconstruction being that instead of the passages 16 extending through thebody of the insulator itself, a groove 35 is formed in the base of theinsulator, the groove being of sufficient depth to more than receive thelocking member 34 so that the.

latter is well'below the surface of the insulator bottom 36. Theconnection between I the pin head 18 and the locking member 34;

is similar to that shown in Figs. 2 and 3.

It will be a parent that an almost unlimited number 0 ways of securingthe supporting pin 13 in place is possible and although I have describedcertain specific ways of doing so and illustrated certain specific formsof construction, it will be understood that various changes, additions,omissions and substitutions can be made therein without departing fromthe spirit of this invention or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. An insulator having in combination a body provided with a holeextending transversely therethrough for connection to an associated wireor the like and channels extend ing transverselyv therethrough onopposite weenie ing therein through which the head of said pin passeswhen said member is partially extended through said channel, and anarrow slot leading from said opening adapted to receive the undercutgrooves on the head of said pin when said member is completely extendedthrough said channel to prevent rotation of said supporting pin.

2. in an insulator, the combination of an insulator body having aplurality of transverse openings therethrough, one of which is disposedbetween and at right angles to the remaining channels for receiving anassociated wire and a recess in the bottom thereof interesecting thelower of said channels, a supporting pin for said insulator projectinginto said recess and provided with a head portion having undercutgrooves forming a square portion on said pin, a strap extending throughsaid intersected channel having a slot provided with a wide portionthrough which the head of said pin is passed and a narrow portion forreceiving and cooperating with the square portion formed by saidundercut grooves for positively locking said pin to said strap member,and means extending through the other of said channels for locking saidstrap to said body portion.

3. The combination in an insulator of a body portion having a recess inthe bottom thereof and a transverse channel extending therethroughintersecting said recess, a supporting member having an undercut headportion disposed in said recess, and a fastening means extending throughsaid transverse channel having a slot provided with an enlarged ortionat one end through which the head 0 said supporting member extends and areduced portion at the other end for engaging the undercut portion ofsaid supporting member and securing the same to said body portion.

4. The combination in an insulator of a body portion having a recess inthe bottom thereof and a transverse channel extending therethroughintersecting said recess, a supporting member having the head thereofdisposed in said recess and a fastening member in the channel having aslot provided with an enlarged portion on one end through which the headof said supporting member extends and a reduced portion at the other endsmaller than the head portion of said supporting member for engaging thesame below the head and securing said member in place.

In testimony whereof, I have hereunto subscribed my name this 2nd day ofApril, 1929.

CHARLES E. MILLER.

